Restless leg syndrome: An uncomfortable (creeping, crawling, tingling, pulling, twitching, tearing, aching, throbbing, prickling, or grabbing) sensation in the calves that occurs while sitting or while lying down. The result is an uncontrollable urge to relieve the uncomfortable sensation by
moving the legs. Restless leg syndrome is a common cause of painful legs. The leg pain typically eases with motion of the legs and becomes more noticeable at rest, worsens during the early evening or later at night, and may cause insomnia.
